package com.zb.util.servlet;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Random;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.json.simple.JSONObject;

@WebServlet("/UploadJsonServlet")
public class UploadJsonServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public UploadJsonServlet() {
        super();
    }

    @SuppressWarnings({ "unchecked", "rawtypes", "unused" })
    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        // 文件保存目录路径
        String savePath = request.getServletContext().getRealPath("/") + "/resources/attached/";
        System.out.println("文件保存目录路径：" + savePath);

        // 文件保存目录URL
        String saveUrl = request.getContextPath() + "/resources/attached/";
        System.out.println("文件保存目录URL：" + saveUrl);

        // 定义允许上传的文件扩展名
        HashMap<String, String> extMap = new HashMap<String, String>();
        extMap.put("image", "gif,jpg,jpeg,png,bmp");
        extMap.put("flash", "swf,flv");
        extMap.put("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
        extMap.put("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");

        // 最大文件大小
        long maxSize = 10000000;

        response.setContentType("text/html; charset=UTF-8");
        if (!ServletFileUpload.isMultipartContent(request)) {
            response.getWriter().println(getError("请选择文件。"));
            return;
        }
        // 检查目录
        File uploadDir = new File(savePath);
        if (!uploadDir.exists()) {
            uploadDir.mkdirs();
        }
        /*
         * if(!uploadDir.isDirectory()){ out.println(getError("上传目录不存在。"));
         * return; }
         */
        // 检查目录写权限
        if (!uploadDir.canWrite()) {
            response.getWriter().println(getError("上传目录没有写权限。"));
            return;
        }

        String dirName = request.getParameter("dir");
        if (dirName == null) {
            dirName = "image";
        }
        if (!extMap.containsKey(dirName)) {
            response.getWriter().println(getError("目录名不正确。"));
            return;
        }
        // 创建文件夹
        savePath += dirName + "/";
        saveUrl += dirName + "/";
        File saveDirFile = new File(savePath);
        if (!saveDirFile.exists()) {
            saveDirFile.mkdirs();
        }
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
        String ymd = sdf.format(new Date());
        savePath += ymd + "/";
        saveUrl += ymd + "/";
        File dirFile = new File(savePath);
        if (!dirFile.exists()) {
            dirFile.mkdirs();
        }

        FileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);
        upload.setHeaderEncoding("UTF-8");
        List items = null;
        try {
            items = upload.parseRequest(request);
        } catch (FileUploadException e1) {
            e1.printStackTrace();
        }
        Iterator itr = items.iterator();
        while (itr.hasNext()) {
            FileItem item = (FileItem) itr.next();
            String fileName = item.getName();
            long fileSize = item.getSize();
            if (!item.isFormField()) {
                // 检查文件大小
                if (item.getSize() > maxSize) {
                    response.getWriter().println(getError("上传文件大小超过限制。"));
                    return;
                }
                // 检查扩展名
                String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
                if (!Arrays.<String> asList(extMap.get(dirName).split(",")).contains(fileExt)) {
                    response.getWriter().println(getError("上传文件扩展名是不允许的扩展名。\n只允许" + extMap.get(dirName) + "格式。"));
                    return;
                }

                SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
                String newFileName = df.format(new Date()) + "_" + new Random().nextInt(1000) + "." + fileExt;
                try {
                    File uploadedFile = new File(savePath, newFileName);
                    item.write(uploadedFile);
                } catch (Exception e) {
                    response.getWriter().println(getError("上传文件失败。"));
                    return;
                }

                JSONObject obj = new JSONObject();
                obj.put("error", 0);
                obj.put("url", saveUrl + newFileName);
                response.getWriter().println(obj.toJSONString());
            }
        }
    }

    @SuppressWarnings("unchecked")
    private String getError(String message) {
        JSONObject obj = new JSONObject();
        obj.put("error", 1);
        obj.put("message", message);
        return obj.toJSONString();
    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}
